<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
            <!-- 添加角色按钮区 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="roleList" border stripe>
                <!-- 扩展 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1 === 0?'bdtop':'','vcenter']" v-for="(item,i1) in scope.row.children" :key="item.id">
                            <!-- 一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item3.id)">{{item.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 二三级权限 -->
                            <el-col :span="19">
                                <!-- 嵌套渲染二级权限 -->
                                <el-row :class="[i2 === 0?'':'bdtop','vcenter']" v-for="(item2,i2) in item.children" 
                                :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row,item3.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3,i3) in item2.children" 
                                        :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row> 
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>     
                </el-table-column>   
            </el-table>
        </el-card>
        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="30%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightlist" :props="treeProps" show-checkbox node-key="id" default-expand-all
            :default-checked-keys="defkeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return {
            // 所有角色列表
            roleList:[],
            // 控制分配权限对话框
            setRightDialogVisible:false,
            // 所有权限的数据
            rightlist:[],
            // 树形控件的属性绑定对象
            treeProps:{
                label:'authName',
                children:'children'
            },
            defkeys:[],
            // 当前即将分配权限的角色id
            roleId:''
        }
    },
    created() {
        this.getRoleList()
    },
    methods :{
        // 获取所有角色
        async getRoleList() {
            const {data:res} = await this.$http.get('roles')
            if(res.meta.status !== 200){
                return this.$messasge.erroe('获取失败')
            }

            this.roleList =res.data
        },
        // 删除
        async removeRightById(role,rightId){
             const confirmResult = 
             await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示',
            {
             confirmButtonText: '确定',
             cancelButtonText: '取消',
             type: 'warning'
            }
        ).catch(err => err)

        if(confirmResult !== 'confirm'){
            return this.$message.info('取消了删除！')
            }

       const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if(res.meta.status !== 200){
            return this.$message.error('删除失败')
        }
         role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            const {data: res} = await this.$http.get('rights/tree')
            if(res.meta.status !== 200){
                return this.$message.error('获取权限数据失败')
            }
            this.rightlist = res.data
            // 获取三级节点的id
            this.getLeafkeys(role,this.defkeys)
            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有权限的id，并保存到数组中
        getLeafkeys(node,arr) {
            // 如果当前node节点不包含children属性，则是三级节点
            if(!node.children){
                return arr.push(node.id)
            }
            node.children.forEach(item => this.getLeafkeys(item,arr))
        },

        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defkeys = []
        },
        // 点击为角色分配权限
        async allotRights(){
            const keys =[
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedNodes()
            ]
            const idStr =key.join(',')
            const {data:res} = await this.$http.post(`roles/
            ${this.roleId}/rights,{rids:idStr}`)
            if(res.status != 200){
                return this.$messasge.error('分配权限失败')
            }
            this.$messasge.success('分配成功')
            this.getRoleList()
            this.setRightDialogVisible = false
        }
  
    }
}
</script>

<style lang="less" scoped>
    .el-tag {
        margin: 7px;
    }
    .bdtop {
        border-top: 1px solid #eee;
    }
    .bdbottom{
        border-bottom: 1px solid #eee;
    }
    .vcenter {
        display: flex;
        align-items: center;
    }
</style>